package com.ruoyi.web.controller.util;

import com.alibaba.fastjson2.JSONObject;
import com.ruoyi.common.utils.sign.Base64;

import java.io.ByteArrayOutputStream;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;

public class MapUtil {

    static double pi = 3.14159265358979324;
    static double a = 6378245.0;
    static double ee = 0.00669342162296594323;
    public final static double x_pi = 3.14159265358979324 * 3000.0 / 180.0;


    /** 把gps原始经纬度转换成百度地图经纬度 */
    public static double[] transGpslocToBaiduloc(Double x,Double y){

        double lot;

        double lat;

        //google 坐标转百度链接   //http://api.map.baidu.com/ag/coord/convert?from=2&to=4&x=116.32715863448607&y=39.990912172420714&callback=BMap.Convertor.cbk_3694

        //gps坐标的type=0

        //google坐标的type=2

        //baidu坐标的type=4
        String path = "http://api.map.baidu.com/ag/coord/convert?from=0&to=4&x="+x+"+&y="+y+"&callback=BMap.Convertor.cbk_7594";
        try
        {
            //使用http请求获取转换结果
            URL url = new URL(path);
            HttpURLConnection conn = (HttpURLConnection) url.openConnection();
            conn.setRequestMethod("GET");
            conn.setConnectTimeout(5 * 1000);
            InputStream inStream = conn.getInputStream();
            ByteArrayOutputStream outStream = new ByteArrayOutputStream();
            byte[] buffer = new byte[1024];
            int len = 0;
            while ((len = inStream.read(buffer)) != -1) {
                outStream.write(buffer, 0, len);
            }

            //得到返回的结果
            String res = outStream.toString();

            //处理结果
            if (res.indexOf("(") > 0 && res.indexOf(")") > 0)
            {
                String str = res.substring(res.indexOf("(") + 1, res.indexOf(")"));
                String err = res.substring(res.indexOf("error") + 7, res.indexOf("error") + 8);
                if ("0".equals(err))
                {
                    JSONObject js = JSONObject.parseObject(str);
                    //编码转换
                    String x1 = new String(Base64.decode(js.getString("x")));
                    String y1 = new String(Base64.decode(js.getString("y")));

                    lot = Double.parseDouble(x1);
                    lat = Double.parseDouble(y1);

                    return new double[]{lot,lat};
                }
            }
        } catch (Exception e)
        {
            e.printStackTrace();
        }
        return null;
    }

    public static double[] wgs2bd(double lat, double lon) {
        double[] wgs2gcj = wgs2gcj(lat, lon);
        double[] gcj2bd = gcj2bd(wgs2gcj[0], wgs2gcj[1]);
        return gcj2bd;
    }

    public static double[] gcj2bd(double lat, double lon) {
        double x = lon;
        double y = lat;
        double z = Math.sqrt(x * x + y * y) + 0.00002 * Math.sin(y * x_pi);
        double theta = Math.atan2(y, x) + 0.000003 * Math.cos(x * x_pi);
        double bd_lon = z * Math.cos(theta) + 0.0065;
        double bd_lat = z * Math.sin(theta) + 0.006;
        return new double[] { bd_lat, bd_lon };
    }

    public static double[] bd2gcj(double lat, double lon) {
        double x = lon - 0.0065, y = lat - 0.006;
        double z = Math.sqrt(x * x + y * y) - 0.00002 * Math.sin(y * x_pi);
        double theta = Math.atan2(y, x) - 0.000003 * Math.cos(x * x_pi);
        double gg_lon = z * Math.cos(theta);
        double gg_lat = z * Math.sin(theta);
        return new double[] { gg_lat, gg_lon };
    }

    public static double[] wgs2gcj(double lat, double lon) {
        double dLat = transformLat(lon - 105.0, lat - 35.0);
        double dLon = transformLon(lon - 105.0, lat - 35.0);
        double radLat = lat / 180.0 * pi;
        double magic = Math.sin(radLat);
        magic = 1 - ee * magic * magic;
        double sqrtMagic = Math.sqrt(magic);
        dLat = (dLat * 180.0) / ((a * (1 - ee)) / (magic * sqrtMagic) * pi);
        dLon = (dLon * 180.0) / (a / sqrtMagic * Math.cos(radLat) * pi);
        double mgLat = lat + dLat;
        double mgLon = lon + dLon;
        double[] loc = { mgLat, mgLon };
        return loc;
    }

    private static double transformLat(double lat, double lon) {
        double ret = -100.0 + 2.0 * lat + 3.0 * lon + 0.2 * lon * lon + 0.1 * lat * lon + 0.2 * Math.sqrt(Math.abs(lat));
        ret += (20.0 * Math.sin(6.0 * lat * pi) + 20.0 * Math.sin(2.0 * lat * pi)) * 2.0 / 3.0;
        ret += (20.0 * Math.sin(lon * pi) + 40.0 * Math.sin(lon / 3.0 * pi)) * 2.0 / 3.0;
        ret += (160.0 * Math.sin(lon / 12.0 * pi) + 320 * Math.sin(lon * pi  / 30.0)) * 2.0 / 3.0;
        return ret;
    }

    private static double transformLon(double lat, double lon) {
        double ret = 300.0 + lat + 2.0 * lon + 0.1 * lat * lat + 0.1 * lat * lon + 0.1 * Math.sqrt(Math.abs(lat));
        ret += (20.0 * Math.sin(6.0 * lat * pi) + 20.0 * Math.sin(2.0 * lat * pi)) * 2.0 / 3.0;
        ret += (20.0 * Math.sin(lat * pi) + 40.0 * Math.sin(lat / 3.0 * pi)) * 2.0 / 3.0;
        ret += (150.0 * Math.sin(lat / 12.0 * pi) + 300.0 * Math.sin(lat / 30.0 * pi)) * 2.0 / 3.0;
        return ret;
    }
}
